Mold for concrete walls.



PATENTED SEPT. 19, 1905:. A. S. MERRIETT. MOLD FOR CONCRETE WALLS.

APPLICATION FILED APR. 10, 1905.

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PATENTED SEPT. 19, 1905;

A S MERRIETT MOLD FOR CONCRETE WALLS.

APPLIOATION FILED APR. 1-0, 1905.

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' UNITED STATES PATENT OFFICE.

'IVIOLD FOR CONCRETE WALLS.

Specification of Letters Patent.

Patented Sept. 19, 1905.

Application filed April 10, 1905. Serial No. 254,625.

To all whom, it may concern:

Be it known that I, ALVA S. MERRIETT, a citizen of the United States, residing at Kansas City, in the county of Wyandotte and State of Kansas, have invented certain new and useful Improvements in Molds for Concrete Walls; and 1 do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the figures of reference marked thereon, which form a part of this specification.

My present invention relates to a mold for concrete walls, and more particularly to a mold for forming walls for dwellings and similar structures in which a continuous air-space in the wall is desired, and to a core for forming the hollow in the wall.

It is the object of my invention to provide a device of the class described which is simple and economical in construction and comprises features of novelty and utility and improved details of structure which will presently be fully described, and pointed out in the claims, reference being had to the accompanying drawings, forming part of this specification,

in which like reference-numerals refer to like parts throughout the several views, and in which Figure 1 is a view in side elevation of several sections of my improved mold supported on a portion of completed wall. Fig. 2 is a top plan view of same, showing the cores for forming the hollow in the wall. Fig. 3 is a transverse vertical section on the line as m, Fig. 2. .Fig. 4 is a detail view of the channel brace-bar in the assembled mold. Fig. 5 is a detail view of a wedge used in binding the members of the brace-bar together. Fig. 6 is a detail view of the stay upon which the ends ofthe mold-section rest. Fig. 7 is a detail view of a keeper used in retaining the moldsections in position after the section of a lower tier have been removed from the wall. Fig. 8 is a detail view of a modified form of bracebar. Fig. 9 is a perspective view of the core used in combination with the mold. Fig. 10 is a detail View of the core-cover. Fig. 11 is a top plan view of the core shown in Fig. 9. Fig. 12 is a longitudinal vertical section on the line Y Y, Fig. 11.

Referring more in detail to the drawings, 2 and 3 designate the front and back plates of my mold, which are shown mounted on a portion of previously-formed wall 1. Said plates have ofisets 4 at each of their lower ends, which rest upon stays 5, laid transversely on said wall. Plates 2 and 3 are further provided. at the top and bottom of each of their ends with lugs 6, which project outwardly and have inwardly-turned lips 7, forming recesses into which the flanges of the channel brace-bars 8 are adapted to fit. Bar 8 is composed of two strips of ordinary channel-iron, each strip having a vertical portion 9 and horizontal portions 10, one of said horizontal portions overlapping the other and each having a series of perforations therein adapted to register with each' other and in which a bolt 12 is secured when it is desired to lock the members of the bar together. By having a plurality of perforations in each member the bar may be adjusted to fit molds of different widths. While the nut of bolt 12 may impinge directly against the face of the bar member, I prefer to have said bolt extending through a slot 13 of a wedge-shaped tighteningblock 14:, which fits within the channel of the upper bar member. When block 14 isused, the members are bound together, as described, and further tightened by forcing block 14 forward in its channel, thereby binding said members still closer together in the manner readily apparent. As before stated, the plates 2 and 3 rest upon a stay 5, which extends transversely across the lower portion of the wall and on the upper edge of the previous mold-plates, and within the ends of stay 5 are perforations 15, through which the vertical portions of bar 8 extend after passing through the recesses formed by lugs 6. The mold-plates are in this manner held firmly together and in alinement while material is being fed to and hardened therein. If so desired, a number'of tiers of the wall may be formed without removing the frontand back plates, each tier being mounted directly upon the preceding in order to give the mold composition time to harden. When this is done, however, it is necessary to remove the brace-bars 8 in order that each succeeding tier of mold-sections may be placed in position. When said bars are removed, a keeper 16, preferably of the form shown in Fig. 7, is inserted into the opening 15 in stay 5. The head 16 of said keeper supports it in position and retains said front and back plates in the same relation to each other as before the brace-bars were removed.

With the mechanism described a solid wall may be formed; but for building purposes it is advisable for several reasons to provide an air-space or hollow within the wall. For this purpose I provide the core shown in detail in Figs. 9 to 12, which comprises a body portion 17, to the ends of which are hinged gates 18 and 19, having end portions extending at right angles to body 17 and side portions parallel with said body, said side portions having beveled edges which meet slightly to one side of the transverse center of the core. Body 17 is straight throughout its extent and is provided at its end with hinge members 20, to which similar members on the ends of gates 18 and 19 are pivoted, said ends having curved portions thereon which fit smoothly against the ends of said body when the core is in its set position. Attached to the body 17 and to one of the gates 18 or 19 are Spreaders 21, having perforated upper horizontal portions 22, which extend over the sides of the moldplates and are held in position by pins, which extend through said perforations and impinge against the outer surface of said plates. If so desired, the spreaders 21 may be dispensed with and latches 23 mounted on the inside of said core. hen in its set position, the core is oblong, as shown in Figs. 9 and 11. After the concrete has been set around the core and it is desired to remove same the spreaders are released and the gates 18 and 19 collapsed inwardly, as indicated in dotted lines in Fig. 11, such inward collapse tending to decrease the length and breadth of the core in order that it may be drawn from the concrete, leaving a recess in each block, which registering or partially registering with similar recesses in the blocks in former and succeeding tiers form a continuous hollow throughout the wall. The gates 18 and 19 are made in sections, with a portion of the ends of the sides.

overlapping the hinged ends. By providing each section with a series of perforations the parts may telescope over each other and be secured together by bolts, which extend through the perforations, and a core of a desired width provided. cover for the core comprising two metal plates, one of which overlaps the other and both being provided at each end with a series of perforations. By sliding the parts of the cover away from or towardth eir center said cover may be adjusted to fit cores of varying widths, the two parts of the cover being secured to-. gether by a suitable bolt when in the desired relation to each other.

In the operation of my device the moldsections are mounted, as described, on a suitable foundation, anyconvenient number of sections being placed in alinement to form a lower tier of the wall. Vith the mold-section in position the cores are placed therein, with one of their end offsets resting on a stayplate supporting the ends of adjoining moldsections. With the mold-section in position concrete is fed thereto around the cores and tamped, if desired, or when it is in a flowing In Fig. 10 I show a.

thereon, so that when the cores are placed in position each end of the cores will be over a portion of two of the adjacent recesses in the former tier. By the removal of the stayplate 5 a transverse opening is provided through the wall, which is connected with the recesses left by the cores, owing to the ends of the cores in adjacent mold sets resting on the stay, as before described, making a connected horizontal hollow in the adjoining halves of two wall-sections, the hollow being broken in the middle of each section by the space left between the inner ends of the cores in each mold set. As the end of each succeeding mold set is posited over the middle of the preceding one a transverse opening is provided directly over the closed portion in the middle of the former section, so that while the cores, being set in a vertical line, leave a direct vertical hollow the transverse openings are in a direct vertical line only in alternate tiers, with the horizontal hollow broken in the middle of each mold-section, ithe only means of air communication between the recesses in a wall-section being through the vertical recess of a succeeding section through the transverse recess left by the stop-plate in said succeeding section and down through the second cored recess.

In this manner a tortuous horlzontal and direct vertical alr-passage 1s formed throughout the wall. When the concrete within the lower tier has been sufficiently hardened, the mold-sections are removed and the stay-plate drawn, the ends of the opening formed by the withdrawal of said plates being closed with mortar, while the inner portion of the opening forms an additional horizontal connection between the recesses left in two adjacent mold-sections.

While I have specifically described my de- Vice, I do not Wish to beunderstood as limiting myself to the exact details of structure herein shown and described, inasmuch as the same may be varied without departing from the spirit of my invention.

Having thus described my invention, what I-claim as new therein, and desire to secure by Letters Patent, is-

1. In a device of the class described, the combination with a set of front and back plates, of lugs on the ends of said plates, stay-plates supporting said front and back plates, and a brace-bar extending through recesses in said lugs and through perforations in said stayplates, for the purpose set forth.

2. A device of the class described, compris- IIO cent to the top and bottom of the outer suring front and back plates having lugs adjaface and near the ends thereof, inwardly-extending lips on said lugs forming recesses between same and the bodies of the lugs, and brace-bars adapted to fit within the lug-recesses of adjacent plates, for the purpose set forth.

3. In a device of the class described,thecornbination with a series of front and back plates, arranged in sets, of stay-plates supporting the abutting ends of each of said sets of plates, each of said plates being provided with an end offset of a depth of the thickness of said stayplates, to provide horizontal alinement of said plates when supported on said stay-plates, and means for spreading said frontand back plates apart, for the purpose set forth.

4. In a device of the class described,the combination with a series of front and back plates, arranged in sets, of Wedge-shaped stay-plates supporting the abutting ends of each of said sets of plates, and brace-bars fitting over said frpint and back plates, for the purpose specifie 5. In a device of the class described, in combination with suitable front and back plates arranged in sets, of angling channeled bracebars fitting over the abutting ends of adjacent sets of said front and back plates, said bracebars being arranged in pairs with the horizontal portion on one member overlapping the horizontal portion of the other member, each of said members having a series of perforations in its horizontal portion, a wedgeshaped tighteningblock fitting within the channel of the upper bar, and a bolt eXtend ing through a slot in said tightening-block and through registering perforations in said bracebar members, for the purpose set forth.

6. In a device of the class described,the combination with the body of the mold of a core, comprising a body-plate, and plates hinged to said body-plate, and side portions on said end plates completing the core.

7. In a device of the class described,the combination with the body of the mold of a core, comprising a body-plate, end plates having curved edges hinged to said body, and side plates adjustably secured to said end plates, substantially as set forth.

8. In a device of the class described, the combination with the body of the mold, of a core comprising the body-plate 17, the end plates 18 and 19, and side plates suitably carried by said end plates, substantially as set forth.

In testimony whereof I aflix my signature in presence of two witnesses.

ALVA S. MERRIETT.

Witnesses:

HUGH B. HULL, ALIcE M. MAXWELL. 

